A new method for the determination of the real part of the hadron elastic scattering amplitude at small angles and high energies

A new method for the determination of the real part of the elastic scattering amplitude is examined for high energy proton-proton elastic scattering at small momentum transfer. This method allows us to decrease the number of model assumptions, to obtain the real part in a narrow region of momentum transfer and to test different models. The real part is computed at a given point t_min near t=0 from the known Coulomb amplitude. One obtains therefore an important constraint on the rho-parameter measuring the ratio of the real to imaginary part of the scattering amplitude at t=0